{"instruction": "You are an expert in event argument extraction. Please extract event arguments and their roles from the input that conform to the schema definition, which already includes event trigger words. If an argument does not exist, return NAN or an empty dictionary. Please respond in the format of a JSON string.", "schema": [{"event_type": "potential therapeutic event", "arguments": ["Subject.Disorder", "Effect", "Subject.Race", "Treatment.Drug", "Subject", "Treatment.Disorder", "Treatment.Time_elapsed", "Subject.Gender", "Subject.Age", "Subject.Population", "Treatment.Freq"]}], "input": "Two patients with imminent gangrene of the extremities caused by ergot-induced arteriospasm underwent mechanical dilatation of the arteries when conventional measures such as anticoagulation, vasodilation, and sympathetic blockade produced no improvement."}
{"potential therapeutic event": []}